A Review of the Genus Eunice - Smithsonian Institution Libraries

322
SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY
TABLE 15.—Variable and invariable features in the type lot of Eunice torresiensis (N = number of individuals
examined; SD = standard deviation; measurements in mm; * = SD not calculated).
VARIABLE FEATURES
No. of setigers
Total length
Maximal width
Length through 10
No. of antennal articulations
No. of peristomial cirral articulations
Branchiae first present from setiger no.
Max. no. of branchial filaments
Ventral cirri inflated through setiger no.
No. of notopodial articulations
Subacicular hooks first present from setiger no.
N
2
2
4
4
4
4
4
4
4
4
3
Max.
99
51
5
9
40
9
6
7
30
10
28
Min.
81
32
2.5
6
34
4
5
6
28
4
19
Mean
90.00
41.50
3.50
7.05
35.75
7.00
5.25
6.50
29.50
6.75
24.67
SD
•
»
1.08
1.37
2.87
2.16
0.50
0.58
1.00
3.20
4.93
INVARIABLE FEATURES
Pectinate setae
No. of pectinate teeth
Shafts of compound falcigers
Acicular color
Acicular shape
Subacicular color
No. of subacicular teeth
N=4
tapering; flat
10
tapering
yellow
pointed or blunt
yellow
3
maintained in middle region of body; towards posterior end
number of filaments increasing to 7; this number maintained in
all but last few segments.
Neuropodial acicular lobes distally truncate; aciculae emerging
at midline. All pre- and postsetal lobes low, transverse
folds. First 4 ventral cirri digitiform. Ventral cirri basally
inflated from setiger 5 through setiger 30. Inflated bases ovate;
narrow tips digitiform. Posterior ventral cirri digitiform without
inflated bases. Notopodial cirri long and digitiform; prebranchial
cirri with up to 6 moniliform articulations; farther back
articulations long, slightly drop-shaped; most cirri with 4
articulations.
Limbate and pectinate setae not observed. Shafts of
compound falcigers (Figure 109h) tapering without ornamentation.
Appendages short, with large heads, bidentate. Proximal
and distal teeth similar in size. Proximal teeth triangular,
directed laterally. Distal teeth tapering, sharply bent. Guards
asymmetrically bluntly pointed; mucros absent. Pseudocompound
falcigers and compound spinigers absent. Aciculae
paired, yellow, distally bent tapering to sharp tips; crosssections
round. Separation between core and sheath indistinct
in both aciculae and subacicular hooks. Subacicular hooks
(Figure 109i) yellow, tridentate with teeth in a crest. Hooks first
present from setiger 24, present in all setigers thereafter, always
single (except for replacements). Hooks with slender main
fangs; secondary teeth nearly as large as main fang and small
tertiary teeth closely appressed to the secondary teeth.
UNKNOWN MORPHOLOGICAL FEATURES.—Relationship between
Mx III and left Mx IV; pygidium and anal cirri.
EXPECTED STATES OF UNKNOWN MORPHOLOGICAL FEA-
TURES.—MX III long, located behind left Mx IV; anal cirri with
moniliform articulations.
CHARACTERS USED IN PREPARATION OF KEY NOT
SCORED.—Inappropriate Characters: 56, 58, 59. Unknown
Characters: 65-68.
ASSUMED STATES FOR PURPOSE OF PREPARING KEY.—
None.
REMARKS.—A clarification of the status of the various types
of this species was issued by Fauchald (1986:257) and the
species is here accepted as defined on that occasion.
Eunice torresiensis is listed with similar species in Tables 46
and 47. Of the species with reduced number of branchial
filaments in a mid-body region, two, E. margariticaea and E.
oliga, have long peristomial cirri reaching at least the middle of
the prostomium; in the other three species, the peristomial cirri
do not outreach the peristomium. Eunice interrupta has
maximally three branchial filaments where the branchiae are
best developed; the two remaining species, E. antennata and E.
torresiensis, have seven filaments. Eunice antennata has stiff,
erect branchiae; in E. torresiensis the branchiae are flexible.
Eunice triantennata (Risso, 1826)
Leodice irianlennata Risso, 1826:422.—Fauvel, 1923:451.
Eunice irtantennala.—Grube, 1850:292.
REMARKS.—Grube (1850:292) referred this species to the
section he called Leodicae Marphysae; Fauvel (1923:451)
called the species possibly a member either of Lysidice or
possibly as Marphysa fallax. No material exist of Risso's
species; it is here considered a Marphysa and will be further
discussed in a review of that genus.